1621505150020 has 48 divisors (see below), whose sum is σ = 3897683733888. Its totient is φ = 555077283840.

The previous prime is 1621505149991. The next prime is 1621505150053. The reversal of 1621505150020 is 200515051261.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8944722 + ... + 9124201.

It is an arithmetic number, because the mean of its divisors is an integer number (81201744456).

Almost surely, 2^{1621505150020} is an apocalyptic number.

1621505150020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1621505150020 is an abundant number, since it is smaller than the sum of its proper divisors (2276178583868).

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

1621505150020 is a wasteful number, since it uses less digits than its factorization.

1621505150020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18069580 (or 18069578 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 28.

It can be divided in two parts, 162150 and 5150020, that added together give a triangular number (5312170 = T₃₂₅₉).

The spelling of 1621505150020 in words is "one trillion, six hundred twenty-one billion, five hundred five million, one hundred fifty thousand, twenty".