20621121435 has 24 divisors (see below), whose sum is σ = 35759387664. Its totient is φ = 10992974400.

The previous prime is 20621121407. The next prime is 20621121449. The reversal of 20621121435 is 53412112602.

20621121435 is a `hidden beast` number, since 2 + 0 + 621 + 1 + 2 + 1 + 4 + 35 = 666.

It is not a de Polignac number, because 20621121435 - 2⁵ = 20621121403 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20621121399 and 20621121408.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1216 + ... + 203085.

It is an arithmetic number, because the mean of its divisors is an integer number (1489974486).

Almost surely, 2^20621121435 is an apocalyptic number.

20621121435 is a deficient number, since it is larger than the sum of its proper divisors (15138266229).

20621121435 is a wasteful number, since it uses less digits than its factorization.

20621121435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206555 (or 206552 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 20621121435 in words is "twenty billion, six hundred twenty-one million, one hundred twenty-one thousand, four hundred thirty-five".