21021015157050 has 24 divisors (see below), whose sum is σ = 52132117589856. Its totient is φ = 5605604041840.

The previous prime is 21021015156983. The next prime is 21021015157081. The reversal of 21021015157050 is 5075151012012.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21021015156999 and 21021015157017.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70070050374 + ... + 70070050673.

It is an arithmetic number, because the mean of its divisors is an integer number (2172171566244).

Almost surely, 2^{21021015157050} is an apocalyptic number.

21021015157050 is an abundant number, since it is smaller than the sum of its proper divisors (31111102432806).

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

21021015157050 is a wasteful number, since it uses less digits than its factorization.

21021015157050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140140101062 (or 140140101057 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 30.

Adding to 21021015157050 its reverse (5075151012012), we get a palindrome (26096166169062).

The spelling of 21021015157050 in words is "twenty-one trillion, twenty-one billion, fifteen million, one hundred fifty-seven thousand, fifty".