1221519950 has 48 divisors (see below), whose sum is σ = 2632227360. Its totient is φ = 413061120.

The previous prime is 1221519931. The next prime is 1221519953. The reversal of 1221519950 is 599151221.

It is a super-2 number, since 2×1221519950² = 2984221976496005000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 1221519950.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221519953) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1646 + ... + 49454.

It is an arithmetic number, because the mean of its divisors is an integer number (54838070).

Almost surely, 2^1221519950 is an apocalyptic number.

1221519950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221519950 is an abundant number, since it is smaller than the sum of its proper divisors (1410707410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221519950 is a wasteful number, since it uses less digits than its factorization.

1221519950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47901 (or 47896 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 35.

The square root of 1221519950 is about 34950.2496414546. The cubic root of 1221519950 is about 1068.9732923777.

The spelling of 1221519950 in words is "one billion, two hundred twenty-one million, five hundred nineteen thousand, nine hundred fifty".